<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        {{msg}}
        <h2>{{firstName}}</h2>
        <h2>{{firstName + lastName}}</h2>
        <h2>{{firstName + ' ' + lastName}}</h2>
        <h2>{{firstName}} {{lastName}}</h2>
        <h2>{{counter * 2}}</h2>
    </div>
</body>
<script src='https://cdn.jsdelivr.net/npm/vue/dist/vue.js '></script>
<script>
    let app = new Vue({
        el: '#app',
        data: {
             msg:'hello vue.js',
             firstName:'kobe',
             lastName:'bryant',
             counter:100
        },
        methods: {

        }
    })
</script>
</html>